UPDATE: 25 May 20011. I’ve added this Seismic Tremor map from the Iceland Met Office site:
And here is a live version:
from the Iceland MET update page here:
Original Article Follows
The green stars are quakes over 3.0 magnetude. The colors of the circles are age, with red being 0 to 4 hours, orange 4 to 12, yellow 12 to 24.
Grimsvotn is one of the red triangles in the middle of the island:
In many ways I like this graph better. It has size vertical and time horizontal. You can see how they have clustered in time better, IMHO.
Well, right on schedule, the Cumulative Seismic Moment at Grimsvotn went vertical and it has started an erruption:
That is the live chart. I’ve captured a copy of it as of now so I can put in a static image at some point (when this graph resets to something less interesting).
From their English pages, they have this report on the volcano:
Eruption has started in Grímsvötn
An eruption began at Grímsvötn volcano at approximately 17:30 UTC, May 21st 2011.
Eruptions in Grímsvötn start as subglacial eruptions, which quickly break the ice cover. At 21:00 UTC, the eruption plume had risen to an altitude of over 65,000 ft (~20 km). Initially, the plume is expected to drift to the east and subsequently to the north. Thus, the ash is not expected to impact aviation in Europe, at least not during the first 24 hours.
The figure on the right (above) shows an image of the eruption cloud at 22:00 UTC. The image is from the Icelandic Met Office weather radar located at Keflavik International Airport, at 220 km distance from the volcano. The cloud extends above a large part of Vatnajökull ice cap. The line marks the approximate location of Grímsvötn volcano.
The last eruption in Grímsvötn occurred in November 2004. Grímsvötn is Iceland’s most frequently erupting volcano.
The figure below shows tremor activity in Grímsvötn associated with the eruption. Note that seismic activity increases after 17:30 UTC.
So I make that about 15 hours ago as I type this.
A h/t to MarkinAustin for watching the Grimsvotn graph and giving a holler when the eruption happened.
Here is a video of the volcano:
Also, a note from Investors Business Daily:
Posted 06:05 PM ET
REYKJAVIK, Iceland, May 21, 2011 (UPI via COMTEX) — Iceland’s Grimsvotn volcano began erupting Saturday, billowing smoke and shaking the ground, the country’s Meteorological Office said.
The volcano last erupted in 2004. Scientist told the British newspaper this eruption is expected to be small and likely will not cause anything similar to the travel chaos Europeans experienced during the eruption of the Eyjafjallajokull volcano in April 2010.
I’d put that “expected to be small” in the “happy talk” bucket. They can hope, but only the volcano knows what it will do.
At any rate, it’s blowing and hasn’t stopped yet (per the Iceland MET site graph).
Some Volcano Stuff
http://pangea.stanford.edu/~dsinnett/Pages/Links.html has a nice collection of links to volcano monitor pages. Just click the pictures for the different volcano observatories.
The Smithsonian page (this updates on Wednesdays, so has nothing yet):